polymerfire: fail to signInWithRedirect() from both mobile Chrome and installed PWA, after PWA is installed (i.e. Add to homescreen)?

Description

signInWithRedirect() fail to authenticate and redirect when sign-in from both mobile Chrome and PWA, after the PWA is installed (i.e. Add to homescreen).

I have posted similar issue with Stackoverflow without much luck: How to signInWithRedirect() without redirecting it to the Installed WebApp?

(Note: Everything is working properly if PWA is not installed/Add to homescreen)

Expected outcome

signInWithRedirect() should properly authenticate and redirect to mobile Chrome and installed PWA correspondingly.

Actual outcome

When sign-in from mobile Chrome

Mobile Chrome will redirect to “Sign in - Google Accounts” page, and after proper authentication, will redirect to the mobile Chrome for a brief moment, and back to “Sign in - Google Accounts” page with a never ending loading progress bar on top.

When sign-in from installed PWA (i.e. Add to homescreen)

PWA will redirect to “Sign in - Google Accounts” page, and after authentication, will return back to the PWA as if it’s not authenticated.

Live Demo

https://x-psk3-init.firebaseapp.com/login

Steps to reproduce

This is a code snippet that I am using:-

  tapGoogleSignIn() {
    // Always allow select account, skip auto login
    let provider = new firebase.auth.GoogleAuthProvider();
    // provider.addScope('https://www.googleapis.com/auth/plus.login');
    provider.setCustomParameters({
      prompt: 'select_account',
    });

    this.$.auth.signInWithRedirect(provider)
      .catch((error) => {
        console.log('error:', error);
      });
  }

Browsers Affected

• Chrome v65 - Android
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10